SA533 in the standard SA-533/SA-533M is a kind of Mn-Mo and Mn-Mo-Ni alloy steel plates material used to fabric high temperature pressure vessels. Just because A533 with the special Manganese , Molybdenum , and Manganese, Molybdenum, Nickel chemical composition, A533 has the right property to be used in high temperature pressure vessel.

SA533 is also a Quenching + Tempering steel material. SA533 have four types ,they are SA533 Gr A, SA533 Gr B, SA533 Gr C, SA533 Gr D steel .Just because A533 with the special Manganese , Molybdenum , and Manganese, Molybdenum, Nickel chemical composition, A533 has the right property to be used in high temperature pressure vessel.